摘要
以双层加肋圆柱壳结构为模型,采用数值方法对结构在水下爆炸冲击载荷作用下的动响应相似性进行研究,在完全几何相似的条件下,在弹性范围内,应用相似规律可将模型实验的结果推广到原型。但由于所有构件尺寸都按同一比例作几何相似,尤其是大缩比时,将导致某些构件(如型材等)的尺寸过小,模型实际建造难以实现,为此,将相似模型作为基础标准形式,根据实际情况对模型进行一定程度的变异,并分别采用了材料等效法和摊板厚法对相似模型进行变异。研究结果表明:材料等效法能较好地通过变异模型反映相似模型结构振动响应特性,但不适合模拟相似模型结构的应力变化;摊板厚法简单易实施,但由于变异模型局部刚度与真实情况不同,将导致实验结果误差过大。
In this paper, numerical simulation is used to probe into the similar responses of the prototype and scale double stiffened cylindrical structure when subjected to underwater explosion. The result of （he scale model can be spread to that of the prototype within the elastic scope when the geometrical conditions are all similar according to the similarity laws. However, if all the parts are scaled in the same proportion especially in a pretty high reduction proportion, some parts （e. g. section bar, etc. ） may be too small to be modeled. Hence, the similar model is considered as a basic standard form, and then model is dissimilated to some extent with material equivalence method and plate thickness sharing method respectively. Results show that the material equivalence method can well reflect the structural vibration response characteristics of similar model while it is not suitable to simulate the stress change of similar model. Plate thickness sharing method is easier to be carried out but the error of the ：experi- mental result could be exceedingly big since the stiffness of the dissimilation model is different from that of prototype. This paper aims to provide reference for the similarity research of the nonlinear dynamics of the structures under transient loads.
出处
《中国造船》
EI
CSCD
北大核心
2007年第4期33-41,共9页
Shipbuilding of China
关键词
船舶
舰船工程
相似理论
水下爆炸
结构
材料等效法
摊板厚法
ship engineering
similarity lence method
plate thickness laws
underwater explosion
sharing method structure
material equiva
作者简介
韩蕴韬,男，1966年生，博士研究生，高级工程师。主要从事水下爆炸载荷作用下的结构动响应研究工作。
张阿漫,男，1981年生，博士。主要从事舰船水下爆炸冲击载荷作用下结构响应方面的研究工作。
姚熊亮,男，1963年生．教授，博士生导师。主要从事船舶结构动力学、船舶结构振动预报与控制、水下冲击载荷作用下的结构响应诸方面的研究工作。
